|Airdate||December 8, 2016|
- "In a Heartbeat" by Kevin MacLeod
- "Full On" by Kevin MacLeod
- "Ossuary 5 - Rest" by Kevin MacLeod
- "Ossuary 6 - Air" by Kevin MacLeod
- This episode was originally entitled "Last Man Standing".
- Seal blowing up the Underground Chamber was inspired by the sixteenth episode of Red vs. Blue: Season 13, where the character Doyle sacrifices himself by blowing up a nuclear reactor.